Simultaneous Transmit/Receive Multi-Functional Ultra-Wideband Transceiver with Reduced Hardware

摘要

Modern wireless systems employ a variety of techniques to overcome limited spec-trum issues. In order to exploit the full available spectrum it is highly desirable to have a single multi-functional and low cost ultra-wideband (UWB) transceiver. To this end, this dissertation proposes the following solutions, 1) receiver hardware reduction, 2) flexible and low cost back-ends for full spectrum utilization, and 3) full-duplex realization for concurrent transmit and receive.;Central to the dissertation is the introduction of a novel on-site coding receiver (OSCR) architecture to significantly reduce hardware requirements at the analog back-end. At the digital back-end, single field programmable gate arrays (FPGA) are used for beamforming. Experimental validation was carried out to demonstrate OSCR using an 8-channel communication back-end operating from 300 - 3800 MHz. Specifically, direction of arrival estimates for multiple beams at different frequencies were successfully demonstrated. This architecture was shown to provide reductions of 85% in power, 80% in cost, and 60% in total hardware as opposed to typical transceivers.;The dissertation also presents a full duplex communication approach for simultaneous transmit receive. Self-interference cancellation filters at the RF domain are presented and tested. They are shown to achieve more than 20 dB cancellation across 500 MHz. This should be compared to the narrowband of < 100 MHz cancellation presented in the past. Antenna isolation and analog baseband cancellation circuits are also proposed to achieve more than 110 dB cancellation.